Effects of Track Structure on the Ion Radiolysis of the Fricke Dosimeter
Effects of Track Structure on the Ion Radiolysis of the Fricke Dosimeter
复制标题
轨道结构对弗里克剂量计离子辐射分解的影响
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. LaVerne
中科院分区：
文献类型：
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作者：
S. Pimblott;J. LaVerne
采用随机IRT方法，结合模拟离子轨迹，对低、高线性能量传递（LET）辐射诱导的Fricke剂量计的化学性质进行了模拟。轨道段的结果与实验确定的差分产率的比较表明，高能电子和非相对论性离子（包括1H， 4He， 12C和20Ne）的结果非常一致。粒子类型和能量对Fricke剂量计的响应有显著影响，反映了辐射诱导自由基的径道内反应、扩散和清除之间的竞争。这种竞争被离子轨道结构的变化所改变。蒙特卡罗轨道结构模拟表明，具有相同速度/电荷比的离子的径向能量损失分布相似，并且约40%的能量最初沉积在轨道轴的水直径内。电离辐射的LET是表征Fricke剂量的一个较差的参数。
The chemistry of the Fricke dosimeter induced by low and high linear energy transfer (LET) radiation has been modeled using the stochastic IRT method, incorporating simulated ion tracks. Comparison of the results for track segments with experimentally determined differential yields shows excellent agreement for energetic electrons, and for nonrelativistic ions, including 1H, 4He, 12C, and 20Ne. There is a significant effect of particle type and energy on the response of the Fricke dosimeter, which reflects the competition between intra-track reaction of the radiation-induced radicals, diffusion, and scavenging. This competition is modified by changes in the ion track structure. Monte Carlo track structure simulations show that the radial energy loss profiles are similar for ions with the same velocity/charge ratio and that ∼40% of the energy is initially deposited within a water diameter of the track axis. The LET of the ionizing radiation is shown to be a poor parameter for characterizing the Fricke dosi...